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Preparation method and application of organic-inorganic hybrid lead-free piezoelectric crystal

A lead-free piezoelectric and inorganic technology, applied in the field of piezoelectric materials, can solve the problems of high production cost, low piezoelectric performance, high preparation temperature, etc., and achieve the effects of low cost, improved piezoelectric performance, and excellent crystalline performance.

Active Publication Date: 2022-03-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Piezoelectric materials are an important class of materials for making piezoelectric devices. PZT and BTO piezoelectric materials with excellent performance have attracted extensive attention from many researchers. However, due to the influence of the inherent properties of materials, ferroelectric ceramic materials require high preparation. Temperature, fragile, almost no mechanical flexibility, and heavy metal elements such as lead, have a great impact on both organisms and the environment
[0004] For lead-free piezoelectric materials, lanthanum gallium silicate (LGS) crystal has excellent piezoelectric properties, and its piezoelectric coefficient and electromechanical coupling coefficient are three times that of quartz crystal, but the high raw material cost limits its application; Rare earth borate crystals also face the problem of high production costs
In addition, for lead-free organic piezoelectric materials, although they have good flexibility, their piezoelectric properties are generally low and cannot replace PZT piezoelectric materials.
[0005] Ca 3 TaAl 3 Si 2 o 14 (CTAS) and Sr 3 TaAl 3 Si 2 o 14 (STAS) crystals, these two crystals use Al on the C site 3+ Instead of Ga 3+ , due to Al 2 o 3 The price is much lower than Ga 2 o 3 , so that the cost of the crystal is greatly reduced, and at the same time it has excellent piezoelectric properties, but it is found in the crystal growth that the above Al 3+ Instead of Ga 3+ The resulting new crystals have poor crystallinity, and it is difficult to obtain large-sized single crystals without macroscopic defects.
At the same time, the existing preparation methods cannot guarantee the normal growth and good morphology of crystals while improving the preparation efficiency.

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  • Preparation method and application of organic-inorganic hybrid lead-free piezoelectric crystal
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  • Preparation method and application of organic-inorganic hybrid lead-free piezoelectric crystal

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[0025] The first aspect of the present invention provides a method for preparing an organic-inorganic hybrid lead-free piezoelectric crystal, comprising the following steps: uniformly mixing bismuth oxide, hydrobromic acid and R(+)-alpha-methylbenzylamine in an oven The organic-inorganic hybrid lead-free piezoelectric crystal can be prepared by carrying out two temperature-lowering processes after medium heating.

[0026] In a typical implementation, after the temperature is raised to 90-120° C., the temperature is lowered, and the temperature is lowered to 35-50° C. to prepare an organic-inorganic hybrid lead-free piezoelectric crystal.

[0027] In a typical implementation, the molar ratio of the bismuth oxide powder to R(+)-alpha-methylbenzylamine is (0.3-0.6):(0.7-1.2), preferably 0.5:1.

[0028] In a typical implementation, the ratio of the volume of the hydrobromic acid solution to the mass of the bismuth oxide powder is (10.56-14.32) ml: (0.5-1.3) g, preferably 11.45 ml:...

Embodiment 1

[0039]Weigh 3.4947g of bismuth oxide powder and pour it into a 100ml wide-mouth glass bottle, measure 40ml of hydrobromic acid solution, pour it into the wide-mouth bottle and cover it, and use a pipette to draw 1.92ml of R(+)-alpha-formazan benzylamine, add to the jar and cap it promptly. Put the jar into a programmed temperature-controlled oven and set the heating and cooling program: it takes 4 hours to rise from ambient temperature to 100°C, keep at 100°C for 2 hours, cool down from 100°C to 50°C, and take 24 hours to cool from 50°C to 40°C It took 48 hours, and then the temperature was maintained at 40°C. After the temperature of the oven was stabilized at 40°C, the jar was taken out, and a yellow transparent massive object was precipitated at the bottom of the bottle, which was an organic-inorganic hybrid lead-free piezoelectric crystal. The crystals were fished out and washed 4 times with n-hexane.

[0040] Table 1 below shows the unit cell parameters of the crystal p...

Embodiment 2

[0045] Weigh 2.5732g of bismuth oxide powder and pour it into a 100ml wide-mouth glass bottle, measure 54ml of hydrobromic acid solution, pour it into the wide-mouth bottle and cover it, and use a pipette to draw 2.32ml of R(+)-alpha-formazan benzylamine, add to the jar and cap it promptly. Put the jar into a programmed temperature-controlled oven, and set the heating and cooling program: it takes 3.5 hours to rise from ambient temperature to 95°C, keep at 95°C for 2.5 hours, cool down from 95°C to 55°C, and take 22 hours to cool from 55°C to It takes 48 hours at 35°C, and then maintains the temperature at 35°C. After the temperature of the oven was stabilized at 35°C, the jar was taken out, and a yellow transparent massive object was precipitated at the bottom of the bottle, which was an organic-inorganic hybrid lead-free piezoelectric crystal. The crystals were fished out and washed 4 times with n-hexane.

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Abstract

The invention relates to a preparation method of an organic-inorganic hybrid lead-free piezoelectric crystal, which comprises the following steps: uniformly mixing bismuth oxide, hydrobromic acid and R (+)-alpha-methylbenzylamine, heating in a drying oven, and cooling twice to obtain the organic-inorganic hybrid lead-free piezoelectric crystal. Compared with a pure organic piezoelectric material, the piezoelectric property is improved. Bismuth atoms are adopted to replace lead atoms to serve as central atoms, preparation of the lead-free material is achieved, and the method is more environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of piezoelectric materials, in particular to a preparation method and application of an organic-inorganic hybrid lead-free piezoelectric crystal. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Piezoelectric materials are an important class of materials for making piezoelectric devices. PZT and BTO piezoelectric materials with excellent performance have attracted extensive attention from many researchers. However, due to the influence of the inherent properties of materials, ferroelectric ceramic materials require high preparation. Temperature, brittleness, almost no mechanical flexibility, and heavy meta...

Claims

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Application Information

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IPC IPC(8): C30B7/14C30B7/08C30B29/10
CPCC30B7/14C30B7/08C30B29/10
Inventor 孙绚张宗一张一凡
Owner SHANDONG UNIV
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